Etymology
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counterpane (n.)

"quilt, coverlet, outer covering of a bed," c. 1600, alteration of earlier counterpoynte (mid-15c.; see counterpoint (n.1)) by influence of French pan "section, piece," from Latin pannus "cloth" (see pane) "in allusion to the panes or squares of which bed covers are often composed" [Century Dictionary].

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quilt (v.)

1550s, "to stuff or interline in the manner of a quilt; to stitch together in the manner of a quilt," from quilt (n.). Related: Quilted; quilting. Quilting bee, "a social gathering of women for the purpose of assisting one of their number in quilting a counterpane," usually followed by a supper or other entertainment, is attested from 1824, originally a New England custom (see bee).

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